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Medical Term:

Wernicke reaction

Pronunciation: vern'ik-e

Definition: in hemianopia, a reaction due to damage of the optic tract, consisting in loss of pupillary constriction when the light is directed to the blind side of the retina; pupillary constriction is maintained when light stimulates the normal side. This sign cannot be seen with a bright light because of intraocular scatter onto the seeing half of the retina.

Synonym(s): Wernicke sign

© Copyright 2016 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.